Search Results - "Gullberg, G.T."
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1
Tomographic reconstruction using an adaptive tetrahedral mesh defined by a point cloud
Published in IEEE transactions on medical imaging (01-09-2006)“…Medical images in nuclear medicine are commonly represented in three dimensions as a stack of two-dimensional images that are reconstructed from tomographic…”
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2
Unmatched projector/backprojector pairs in an iterative reconstruction algorithm
Published in IEEE transactions on medical imaging (01-05-2000)“…Computational burden is a major concern when an iterative algorithm is used to reconstruct a three-dimensional (3-D) image with attenuation, detector response,…”
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3
Normal and Pathological NCAT Image and Phantom Data Based on Physiologically Realistic Left Ventricle Finite-Element Models
Published in IEEE transactions on medical imaging (01-12-2006)“…The four-dimensional (4-D) NURBS-based cardiac-torso (NCAT) phantom, which provides a realistic model of the normal human anatomy and cardiac and respiratory…”
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4
Reconstruction From Uniformly Attenuated SPECT Projection Data Using the DBH Method
Published in IEEE transactions on medical imaging (01-01-2009)“…An algorithm was developed for the 2-D reconstruction of truncated and nontruncated uniformly attenuated data acquired from single photon emission computed…”
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5
Total variation regulated EM algorithm [SPECT reconstruction]
Published in IEEE transactions on nuclear science (01-12-1999)“…An iterative Bayesian reconstruction algorithm based on the total variation (TV) norm constraint is proposed. The motivation for using TV regularization is…”
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6
Correction for ambiguous solutions in factor analysis using a penalized least squares objective
Published in IEEE transactions on medical imaging (01-03-2002)“…Factor analysis is a powerful tool used for the analysis of dynamic studies. One of the major drawbacks of factor analysis of dynamic structures (FADS) is that…”
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7
Comparison of channelized hotelling and human observers in determining optimum OS-EM reconstruction parameters for myocardial SPECT
Published in IEEE transactions on nuclear science (01-06-2006)“…The performance of the Channelized Hotelling Observer (CHO) was compared to that of human observers for determining optimum parameters for the iterative OS-EM…”
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8
Direct least-squares estimation of spatiotemporal distributions from dynamic SPECT projections using a spatial segmentation and temporal B-splines
Published in IEEE transactions on medical imaging (01-05-2000)“…Artifacts can result when reconstructing a dynamic image sequence from inconsistent, as well as insufficient and truncated, cone beam single photon emission…”
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9
Cardiac Imaging Using a Four-Segment Slant-Hole Collimator
Published in IEEE transactions on nuclear science (01-10-2006)“…The main objective of this paper is to evaluate four-segment slant-hole (FSSH) SPECT for cardiac imaging. FSSH is a slant-hole collimator that is divided into…”
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10
Toward accurate attenuation correction in SPECT without transmission measurements
Published in IEEE transactions on medical imaging (01-10-1997)“…The current trend in attenuation correction for single photon emission computed tomography (SPECT) is to measure and reconstruct the attenuation coefficient…”
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11
Cardiac single-photon emission-computed tomography using combined cone-beam/fan-beam collimation
Published in IEEE transactions on nuclear science (01-02-2005)“…The objective of this work is to increase system sensitivity in cardiac single-photon emission-computed tomography (SPECT) studies without increasing patient…”
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12
Accuracy and precision of compartmental model parameters obtained from directly estimated dynamic SPECT time-activity curves
Published in IEEE transactions on nuclear science (01-02-2004)“…Quantitative kinetic analysis of dynamic cardiac single photon emission computed tomography (SPECT) data has the potential to provide better contrast between…”
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13
A channelized-hotelling-trace collimator design method based on reconstruction rather than projections
Published in IEEE transactions on nuclear science (01-10-2002)“…In this paper, a new single-photon emission-computed tomography (SPECT) collimator design technique is investigated. In this feasibility study, the collimator…”
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14
Evaluation of parallel and fan-beam data acquisition geometries and strategies for myocardial SPECT imaging
Published in IEEE transactions on nuclear science (01-06-2004)“…This study evaluates myocardial SPECT images obtained from parallel-hole (PH) and fan-beam (FB) collimator geometries using both circular-orbit (CO) and…”
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15
Parametric image formation using clustering for dynamic cardiac SPECT
Published in IEEE transactions on nuclear science (01-10-2003)“…Dynamic cardiac SPECT imaging can provide quantitative and possibly even absolute measures of physiological parameters. However, a dynamic cardiac SPECT study…”
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16
The prolate spheroidal transform for gated SPECT
Published in IEEE TRANS NUCL SCI (01-06-2001)“…Proposes a method to calculate the volume and surface area of the left ventricle (LV) in the prolate spheroidal coordinate system. The prolate spheroidal…”
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17
Deformable model of the heart with fiber structure
Published in IEEE transactions on nuclear science (01-06-2002)“…A kinematic model of the heart with incompressibility constraints was implemented. It accounts for the effects of the heart fiber structure, which plays a…”
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18
Nonuniform attenuation correction using simultaneous transmission and emission converging tomography
Published in IEEE transactions on nuclear science (01-08-1992)“…Photon attenuation in cardiac single photon emission computed tomography (SPECT) is a major factor contributing to the quantitative inaccuracy and the decrease…”
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19
Cone-beam iterative reconstruction of a segment of a long object
Published in IEEE transactions on nuclear science (01-02-2002)“…This study was performed to investigate the iterative reconstruction of a segment of a long object using cone-beam projections acquired with a practical-sized…”
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20
Asymmetric cone-beam transmission tomography
Published in IEEE TRANS NUCL SCI (01-02-2001)“…Transmission scans are an important part of the process of obtaining patient attenuation maps for accurate SPECT (single photon emission computed tomography)…”
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Journal Article Conference Proceeding